(1) "Air contaminants" as used in this rule,
means hazardous concentrations of fibrosis-producing or toxic dusts, toxic
fumes, toxic mists, toxic vapors, or toxic vapors, or toxic gases, or a
combination of these, suspended in the atmosphere.

(3) "Confined space" means any tank, vessel,
container, or pit so enclosed that adequate ventilation is not obtained by
natural air movement.

(4) "Duct"
means any pipe, flue, or channel forming a part of a ventilating system used to
convey air, dusts, fumes, mists, vapors, or gases.

(5) "Dust" means particles of solid matter,
other than fumes, no more than one hundred microns in their greatest
dimension.

(6) "Exhaust system"
means a complete suction system, including all hoods, ducts, fans, separators,
and receptacles, when required, and any other part necessary for the proper
installation and operation thereof.

(7) "Fan" means the equipment which creates
the movement of air in a mechanical system of ventilation.

(11) "Hazardous concentrations" as applied to
air contaminants, means concentrations which are known to the employer to be in
excess of those which would not normally result in injury to an employee's
health if the employee had not been previously exposed to such air
contaminants.

(12) "Hood" means
that part of an exhaust system into which the contaminated air or dust, fumes,
mist, vapor, or gas first enters.

(a) "Capture velocity" means the velocity at
any point in front of the hood necessary to overcome the opposing air currents
and to capture the contaminated air by causing it to flow into the exhaust
hood.

Valves, fittings, and accessories connected directly to the
container, including primary shut-off valves, shall have a rated working
pressure of no less than two hundred fifty P.S.I.G. and shall be of material
and design suitable for LP-gas service.

Containers shall be upright upon firm foundations or otherwise
firmly secured. The possible effect on the outlet piping of settling shall be
guarded against by a flexible connection or special fitting.

(i) When operational
requirements make use of portable containers necessary, and their location
outside of buildings or structures is impracticable, containers and equipment
shall be permitted to be used inside of buildings or structures.

(iii) Valves on containers
having water capacity greater than fifty pounds (nominal twenty pounds LP-gas
capacity) shall be protected from damage while in use or storage.

(iv) Hose used for LP-gas shall have a
working pressure of no less than two hundred fifty P.S.I.G. The use of aluminum
piping or tubing is prohibited.

(v)
Portable heaters, including salamanders, shall be equipped with an approved
automatic device to shut off the flow of gas to the main burner, and pilot, in
the event of flame failure, except that this provision does not apply to
portable heaters under seven thousand five hundred B.t.u. per hour, input when
used with containers having a maximum water capacity of two and one-half
pounds. Portable heaters, having inputs above fifty thousand B.t.u. per hour,
shall be equipped with either a pilot, which must be lighted and proved before
the main burner can be turned on, or an electrical ignition system.

(vi) Containers, regulating equipment,
manifolds, piping, tubing, and hose shall be located to avoid exposure to high
temperatures or physical damage.

(vii) Containers having a water capacity
greater than two and one-half pounds (nominal one pound LP-gas capacity)
connected for use shall stand on a firm and level surface and shall be secured
in an upright position.

(viii) The
maximum water capacity of individual containers shall be two hundred forty-five
pounds (nominal one hundred pounds LP-gas capacity).

(ix) For temporary heating, heaters (other
than integral heater-container units) shall be located no less than six feet
from any LP-gas container.

(x) When
heaters are connected to containers for use in an unpartitioned area on the
same floor, the total water capacity of containers, manifolded together for
connection to a heater or heaters, shall be no greater than seven hundred
thirty-five pounds (nominal three hundred pounds LP-gas capacity). Such
manifolds shall be separated by no less than twenty feet.

(a) Mixing asbestos shall be done wet or in
an enclosed, ventilated area.

(b)
The employer shall provide and shall require the employee to wear approved
respirators when mixing, sawing, spraying, applying, and cleaning up where
asbestos is used.

(c) Damaged bags
or containers of asbestos shall be wrapped or enclosed in an airtight container
before handling.

(d) When cleaning
up, all surfaces shall be sprayed with water or shall be vacuumed by
high-efficiency particulate air (HEPA) filtered equipment capable of trapping
and retaining at least 99.97 per cent of all monodispersed particles of 0.3
micrometers in diameter or larger.

The ductwork of the exhaust system shall be of a size suitable
for conducting the contaminated air outdoors, or the exhaust ductwork shall
provide no less than the minimum transport velocity necessary to remove the
particulate material produced by the operation being performed, to a
collector.

The outlet from every separator or from every collector shall
discharge the air contaminants collected by the exhaust system, in such manner
that the discharged materials shall not re-enter the working area in hazardous
concentrations.

Air supply openings or inlets through which air enters the
building or room in which the local exhaust system is in operation shall be
isolated from any known source of contamination from outside of the
building.

Under no circumstances shall a confined space be entered to
make any of the following prescribed tests.

(1) No employer shall permit entrance into
any confined space unless a confined space entry procedure, incorporating one
of the following, is used:

(a) Air sampling
shall be performed by qualified, trained personnel prior to and periodically
during occupancy to determine either that:

(i)
The atmosphere within the confined space contains an adequate quantity of
oxygen ( 19.5 per cent) and harmful atmospheric contaminants have been diluted
to safe concentrations; or

(ii)
Adequate mechanically induced dilution ventilation is used prior to entry and
continued in use during occupancy to ensure that no less than 19.5 per cent
oxygen is maintained in the confined space.

(b) A supplied-air respirator or
self-contained breathing apparatus is provided and used.

(2) When the confined space has been exposed
to, contained, or is likely to have combustible gases within its confines (such
as sewage treatment plants), it shall not be entered if any reading in excess
of ten per cent of its lower flammable limit (LFL) is obtained on a combustible
gas indicator (see Appendix III to rule
4123:1-3-16 of the
Administrative Code).

(3) If tests
under paragraph (G)(1)(a) or (G)(2) of this rule indicate that the atmosphere
in the space to be entered contains:

(a) A
concentration of flammable vapor or gas in excess of ten per cent of its LFL;
and/or,

Then appropriate control measures shall be instituted. Control
measures may consist of forced or natural ventilation, use of personal
protective equipment, a combination of these, or other effective control
techniques.

(a) A procedure for safe entry into confined
spaces shall be established and used.

(b) The following are recommended procedures
to comply with standards:

(i) Designate at
least one trained person to be responsible for adherence to entry procedures
and require written approval by that person before permitting anyone to enter
the confined space;

(ii) Post
danger signs or by any other equally effective means, of the existence and
location of the permit spaces.

Note: A sign reading "Danger -- Permit - Required Confined
Space, Do Not Enter," or using other similar language would satisfy the
requirement for a sign.

(iii) Provide periodic instruction and
training in proper entry procedures to be used;

(iv) Standby personnel where provided shall
be required at all times to be in communication with the employee within the
confined space; an alarm or two-way radio system for the standby employee will
be effective;

(v) Approved rescue
equipment should be available; since entry ports for confined spaces vary in
size, precaution should be used in obtaining proper size equipment;

(vi) Establish procedures to prevent ignition
of combustible atmospheres or re-entry of gases or liquids by locking out
switches and blanking off transmission pipes; use nonsparking tools;

(vii) Prevent generation of contaminants by
neutralizing or flushing out residual materials;

(viii) In testing for contaminants use only
approved instruments maintained in proper working order;

(ix) Continual monitoring of oxygen and
contaminant concentrations during occupancy;

(x) If respiratory equipment is used off of
an air compressor piped system, this system shall meet the specifications of
the "Compressed Gas Association," to assure a supply of uncontaminated
air;

(xi) When supplied-air or
self-contained respiratory apparatus is used, personnel should be trained in
the proper use of such apparatus.

(xii) Many employers use tags to show that a
confined space may be entered safely. An example of such a tag is as follows:

(a) In all cases when an employee is
stationed outside a compartment, tank, or space, as a tender for the employees
working inside, the tender shall have immediately available for emergency use
all necessary personal protective equipment. The tender shall wear the personal
protective equipment if exposed for prolonged periods which are hazardous to
the tender's health.

(b) When
entering a toxic or flammable atmosphere, an employee shall be provided with
and use an adequate, attended, lifeline.